This series of desktop-style computers with 486 processors includes the 4/25S, 4/33S, 4/50, 4/50S, 4/66, and 4/100 models. They feature a relatively compact design with a 3.5" disk drive, and meet the system requirements for Windows 3.x or 95. The models with 66 MHz or faster processors and at least sixteen megabytes of memory can use Windows 98 as well, although an older operating system is likely to run more quickly. See these links for additional information...